Understanding "Purchase" vs. "Conversions" in Google Ads?

Hey everyone,

I’m running some Performance Max campaigns and have set "Purchase" as my account’s default goal conversion for all PM campaigns. However, I’ve noticed some discrepancies between "Conversions" and "Purchase" metrics in my reports.

How is "Purchase" different from "Conversions" in Google Ads?
Why is there a difference in the reported values of Conversions and Purchases?
I even have one campaign where there are 34.25 Conversions, but 0 Purchases—why could this be happening?
Also, why do I see decimal values for "Purchase" and "Conversions" instead of whole numbers?

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